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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e0f8bd064ca31fa210bb95c6c27b94cc123dd63cda829a367d618b002698c8' 
  AND token = 'EJSY3ECr2xM7Tf7AF0G+EZPlyN92HvakdQ7SSSzbVq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}